A police officer looks at flowers on Tuesday Dec. 23, 2014, left close to the scene in George Square, Glasgow Scotland where on Monday a garbage truck crashed into a group of pedestrians which has left a number of people dead. (AP Photo/Danny Lawson/PA) UNITED KINGDOM OUT

The Associated Press

A police officer looks at flowers on Tuesday Dec. 23, 2014, left close to the scene in George Square, Glasgow Scotland where on Monday a garbage truck crashed into a group of pedestrians which has left a number of people dead. (AP Photo/Danny Lawson/PA) UNITED KINGDOM OUT

A police officer looks at flowers on Tuesday Dec. 23, 2014, left close to the scene in George Square, Glasgow Scotland where on Monday a garbage truck crashed into a group of pedestrians which has left a number of people dead. (AP Photo/Danny Lawson/PA) UNITED KINGDOM OUT (The Associated Press)

A police officer looks at flowers on Tuesday Dec. 23, 2014, left close to the scene in George Square, Glasgow Scotland where on Monday a garbage truck crashed into a group of pedestrians which has left a number of people dead. (AP Photo/Danny Lawson/PA) UNITED KINGDOM OUT